/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import { useEffect, useRef } from 'react';

export function useLastDefinedDeep<T>(cur: T | undefined): T | undefined {
  const last = useRef<T>();

  useEffect(() => {
    if (typeof cur === 'undefined' || JSON.stringify(last.current) === JSON.stringify(cur)) return;
    last.current = cur;
  }, [cur]);

  return typeof cur === 'undefined' ? last.current : cur;
}
